Yamaha YBR 125 workshop manuals on Ebay UK
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Safety Message: Maintenance involves handling hot components and flammable fluids. Ensure the motorcycle is secure on a center stand before beginning. Always dispose of used engine oil and fluids at a certified recycling center. If you are unsure about any procedure, consult a professional mechanic.
Keeping your Yamaha YBR 125 (or the newer YS125) in top condition requires following the correct factory specifications. Whether you have the early carburetor model or the latest Euro 5 fuel-injected version, these are the essential numbers you need for your next service.
1. Essential Service Parts
Before starting your maintenance, grab these essential items. Buying in bundles on eBay is the most efficient way to maintain your bike:
Yamaha YBR 125 Full Service Kits – Includes oil, air filter, and NGK spark plug.Heavy Duty Drive Chain & Sprocket Sets – Replace these if you notice "hooked" teeth or uneven stretching.EBC Brake Pads & Shoes – High-quality stopping power for all-weather commuting.
2. Engine & Lubrication Specs
Engine Oil Capacity: 1.0 Litre (Total); 0.9 Litre (Periodic change).
Oil Type: 10W-40 4-Stroke Mineral or Semi-Synthetic (JASO MA compliant).
Spark Plug: NGK CR6HSA (Gap: 0.6mm – 0.7mm).
Idle Speed: 1,300 – 1,500 RPM (Adjust when the engine is warm).
3. Valve Clearances (Engine Cold)
Correct clearances are vital for starting reliability and fuel economy:
Inlet Valve: 0.08mm – 0.12mm
Exhaust Valve: 0.10mm – 0.14mm
4. Chassis, Tires & Chain
Tire Pressure (Front): 25 PSI (1.75 bar).
Tire Pressure (Rear): 29 PSI (2.00 bar) / 33 PSI with a pillion passenger.
Chain Slack: 20mm – 30mm (Measured midway between sprockets).
Fork Oil: 10W Fork Oil (approx. 155ml to 160ml per leg depending on year—check your specific VIN).
5. 2026 Maintenance Pro-Tip: The Centrifugal Filter
The YBR 125 does not use a paper oil filter. To truly "service" the engine, you must remove the right-hand crankcase cover every 6,000 miles to clean the centrifugal oil filter. If you only change the oil, metal particles will continue to circulate, shortening the life of your crankshaft bearings.
Yamaha YBR 125 XT 125 servicing maintenance specifications
wheel F/R and sprocket carrier sizes ?
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